Is there any alternative for Zoomit on Ubuntu?

Solution 1:

Gromit-MPX

You might want to give Gromit-MPX (which I authored) a try:

Gromit-MPX is an on-screen annotation tool that works with any Unix desktop environment under X11 as well as Wayland.

It's hotkey-based so there are no widgets in your way. Also, you can configure colors, mouse button mappings and hotkeys. No zooming though, only annotations. Go here for details.

You can install it through Flathub.

Solution 2:

If you have Ubuntu, you should have compiz, so use compizconfig-settings-manager to turn on some plugins. This manager is in software-center with plugins too. When you will have some problems with crashing of compiz because your testing, install fusion-icon to quick reloading it.

compizconfig-settings-manager can be launched by command ccsm.

Annotate (under Extras): Drawing on the screen.

Enhanced Zoom Desktop (under accessibility): Does that zoom.

Set-up shortcut as you like and enjoy. :)